Aaaaalso: There are games and simulations. The latter are characterized by the fact that they require a long training period, for beginners can be very frustrating and never einheimsen best values in games magazines. A little off the mainstream so.
ArmA 3 belongs like its predecessors to this genre (I do not want to talk about realism and no now: it does not hurt if you get hit).
For fans of the series: strike! The campaign comes in October in the form of three free DLCs. Multiplayer and Showcase missions work already.
For the Battlefield and CoD fraction (I play these games even love): No! As much as I Bohemia also selling success begrudge: Buys's not. You are doing you the biggest favor and the ArmA fans the second largest.
From me there's four stars. Only four, because I think that there is still a piece could be better.
Update from 24.11.13: In the meantime, the first part of the campaign for more than 3 weeks is indeed available and I'm really excited. I have the campaign now complete two and will probably go a 3rd time to campaign. ARMA 3 is the best part of the series and I really know every part and every addon. Unfortunately, it'll work with me to the multiplayer not - but not for technical reasons, but because I just do not find the appropriate players. Unlike Battlefield and Co. is much more dependent on a good team and can be found just not so easy. I give one star more, because the campaign is really very good .... until now.